package main
import "fmt"
func main() {
	var a int = 23
	var b float64 = 3.14
	var c bool = true
	var d string = "hello go"
	fmt.Printf("a=%d, b=%f, c=%t, d=%s\n", a, b, c, d)
}
/* 结果:
a=23, b=3.140000, c=true, d=hello go

*/